⚠
warning Worcester
Error Code EMS connection not possible
EMS (Energy Management System) connection has failed — appliance cannot communicate with external control system.
? What Causes This
Loss of communication with EMS control unit, wiring issue, or control system malfunction.
✓ How to Fix It
- Check EMS control unit connection and wiring.
- Verify EMS control unit is powered on.
- Contact a qualified service engineer if the issue persists.
Source: page 10 of the official manual
From the manual
This error code appears in:
Worcester Greenstar 1000 GR1000W 30C NG Boiler